Re: [MMUSIC] Streaming media

Gonzalo Camarillo wrote:

> Hi,
>
> I kind of remember that some time ago there was a proposal about an SDP
> attribute to indicate that the receiver could use long buffers to
> receive the media. I believe it dealt with tones, mainly.
>

Right (sort of). The basic discussion was support of fax and modem calls
and we've had a couple of different drafts on this topic (starting in
London 2001), with the latest one being
<draft-rajeshkumar-mmusic-gpmd-01.txt>. The approach taken has been to
associate optional attributes with a particular payload type in order to
indicate certain characeteristics about the media that the receiver may
benefit from knowing. For example, the gpmd draft defines a "voice band
data" attribute to indicate that the media is voice-band data. However, we
would not try and specify implementation specific ways of dealing with
"voice-band data" such as use of long buffers or other.

>
> I was thinking that if we establish a session using SIP that will carry
> streaming media, we may want to tell the other end that it can buffer
> this stream.
>

I believe the gpmd framework could be used for this, but in a slightly
different way. Rather than specifying that "media can be buffered" we would
have a more generic attribute that defines the media as "streaming" and
hence the receiver can apply whatever special processing it may desire for
streaming media, e.g. buffering it.

>
> What is the status of that work? was there any interest in the group?
>

There has been some interest expressed (mostly by modem folks) and the work
is being performed in the MMUSIC WG, although as an individual submission.
There are a few issues with the current gpmd draft and we will be issuing a
new version. Assuming it does not generate any major comments, we will then
be asking for a WG last call on it.

-- Flemming

>
> Thanks,
>
> Gonzalo
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